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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a01064edbe93c9482ba8bddcaa597ca248ad89e4aa6f3ef219adcc680e3307' 
  AND token = 'UbAMGu5wocdSHHJaZX0hyuvLs7rp1pD0+90RtIZkklU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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