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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea152d55df3dcd35586dccbec70aecb86fcd9b41b088da2e3997fe2151ca5459' 
  AND token = 'n7JkaA84gMEOtxRJmRpsrI78n1gAqpkZoYjvaqTcVD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}