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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abbf180772f5040ea7cf24288f9fe8fe89f39dc9730f3f744849f03aaed9aac' 
  AND token = 'X2cJFe11oVR2hFsJlNNdXOl0b4dwM1/s8fpdHEazJJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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