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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26166bffdbfded26c5545e2ff6068f620aefb7059257503af45cbc75063566fa' 
  AND token = 'JGuLO2B1P0GfxKrBmT2kf99Df85T4ef8Z57TjSMlqW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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