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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd3fed04a0b99b31d6dd6942fd986fce9954979fe50a993ff0bfe9f065f065c' 
  AND token = '0agbEY+u3blFPmotXADpr7nyEJne4m773pYK2Mc1gsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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