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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42a0ec155157232aa1bf30be1fa045814c2a91a908fd20fb034b3d2ea21151d7' 
  AND token = 'f1n9Tpy4oCpPyYWXu0G8pr7ICmlk/LADfbr0OUXX6cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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