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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '038af77b3602d9814fe3e149e6821329cbf2e75857ef46001bdf49064b479663' 
  AND token = 'a735n5p6aWbnfEhrILDmiH0DbrWLc81APUecyhRJVY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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