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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153f92a7912a919b787a492714d58492b7d214466c20937fe0ea100548ca74e0' 
  AND token = 'HBtMDnPIXLRZz3iN3pkhn6psrZglz2+6xOHfAlKpyVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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