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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '485a999fcfc7c5114bf861ede1869fcbc4c5eafe6debb08a8204a0805f35d677' 
  AND token = 'zMHcNLPj26Jtcpf6LJCGR7uLoAT7WgD9/HeEQ6Gn4w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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