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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09cbec85f2c9506a0588fd7601201789eaa60da51e4b61f14d25ed3124380018' 
  AND token = '0hE8n15sEWGul1RiyHD0tvCENGdxGOTrnG/1CCP11bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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