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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2ce0cad50130e110fe4ea0b61f3ab2b06026940877ff0b80fd8aec9fc0ba25' 
  AND token = 'gKLQj5V6y5cm0B9V2hXI+6ebQR/0826Fg5qOdvXRVG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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