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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f2a259dece72ff13a29d7bed5e35d0c23a307f89d81ead3af6ed13f7b772f2a' 
  AND token = 'MwlBtZ4Vd3t/PtkWwhqZ9X+r6JL0W+eLfd3W2uFGCVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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