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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a0158a8dfa3a2273b0c94ab56fc06555390a065932910c8f5ae75e1b7d0c31c' 
  AND token = 'gyFHxBqYLOQe0pkSFHFMyk/Vxrv6VPU3fuYC9ioQgjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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