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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7f5a7afb15f0e28f3db7691995b82045fa02135b39abb7ed7e64b8f561f817' 
  AND token = 'woTuRWHrtcCnQtD8zkU5iypv5U47ELcXI3T6l/6Indg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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