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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff32c4eb7164a3bbc274a650d91e8221ed74fb43edd2e299d7d74bb4379104e' 
  AND token = 'SqY3J21f5mdU8hvXDErrhHOHzFDZ7o/tqYft3UVpGDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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