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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6586cbd7ef4819b9ac7aa89b483eb565597b8abed230026697a203ea27bf55c1' 
  AND token = 'tIOlEUu18NvSNGJu2bdm9ANdO8yjg6YHA+989JWSMdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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