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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903c09a7e28631c8513b66729bef51193e0bbbc74ef35717cb59ab6cedbb8d62' 
  AND token = '6Y6sm+RSjTQZ2cb8to3rSnDTH4w8RoAAAvoNtUoR1j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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