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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '985610731a934fd7217e4e5fd934eeec55cd7ecd51cc0a4e5f9ee02630535cd8' 
  AND token = 'c7Z9q9V3PbvfvowM1wEruM290gYNDTZXU+JqtdcU4UM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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