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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29079faed5eec6d7458b92aa94eab3f695d8f26c2a2c1cdba9ba0239d982c774' 
  AND token = 'Lnlta7PmjqVy52uRUSnicuc5VelBJdhLELVNpiByaM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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