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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba02e0a812183a5a2277750ca1b8761431ef869a0b7f8c815e8d8e41438cad27' 
  AND token = 'tJaFHA+ovNhY56EsE2Pp6cojDkQdMPnyMPhLh2hnWa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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