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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afaf2faf410af5db45d87b10ea243117c98b27d6af39e6b841c5e7d75c91b17f' 
  AND token = 'lLdqq8C11IU/SvGsNHytYIPCbf0O57qpuPPxjMbNNok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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