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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b4e6168837b6c44b0e6d4c9a98c7811f98017ec9cd0942dae8a7e171d2cc0a' 
  AND token = 'CPC1S1fmcQyO0gOh37ZbhR75s44Si0p0abHJ8aWpSUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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