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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a773bc536b89f8f01fea0a4e4378babc90cbbe57f9bca754683bdbb0cc4cabfb' 
  AND token = 'HPLh1sJecyI3rl8Ir84noQFg3Xax12OvrkiKx7Pdz8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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