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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1da44e6604f3945f0c04b5f1de3a9f2cb3a5874e18066c804db4e93b0c730a' 
  AND token = '9nJhYE03WU7KonQC1YrGVRo7RbkgIlTkashRj+F/jL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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