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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43d9534852131656941fa8b802a06e04b2c1f524e1868a41a2e92d971d22c535' 
  AND token = '/0B4DdJnQvXiy/WADqtgN78y/O9UmBqKRRbtfMeacyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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