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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6ff2b0d62ec22fc2ca7844197e3b30d3c79a68e52a6bb4ed4732c0cc3cf528' 
  AND token = 'kRvNpHaecxlvZmsZG+wFLJyar5JWkK26iae8JbNORVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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