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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f8162744079acbd82d84fba93285d235b33876fcde7be3aaa7ee6deb1955a59' 
  AND token = 'A4u3FGxkeCMPYoLGTXX12oLDUb5mu092CE8upl4a1AU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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