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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a4c0b38004ec79083575f6effa3e35cca5e5fc1aba967c8fbb8aa0c5df90e7' 
  AND token = '34A/q+aSYfpRrhKHme0SfD/fzxFsUyySruMycmzj+C8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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