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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3d588d23fa1cd849df0898dfdd2e31a85a31ef0d068c49a1e90529e7415fee' 
  AND token = 'xHAFnqbzCsD41v1N5L6zMFm7v454X+aOaQ1oBYxQ7bU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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