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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3abe857fc30065cfa6c3954f4a3339d1132c67265ef598d28282d2b0de4e3beb' 
  AND token = 'cXEbYa3H5OiQehazGEk2xS8U/c+9G1N+iT/LxgMzun4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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