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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7869d3fe529d0e53a31f7f9ccdf2020e84351ef7cd7957d4355cb6ca1cf37a1d' 
  AND token = '7DhEBPVV3sJcjbgHvfFwDcAeWcB3Hk6Jy4lQUxYYVc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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