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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00dcbd85d54618507761ad804f02ab6320cf6aafdf9e4e54d0988860c76050c4' 
  AND token = 's7C88eQGSZi9HLI8FS0BPA9P4JGSbTjzg1G869effIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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