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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e32983b708477a1ab2523f4f72a7d9067ea19a1e7d44a0f17e7c7e60bbf3529' 
  AND token = 'stlzKkvs3S6v/PaBTfYcbuQSTGzJqbKLwsFjq511Peo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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