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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7fe99d00b91bb29598c0515e547b7d9462b62ca8a88ba89c18cbbbdd1e5771' 
  AND token = 'PFklX33K+ryOICVDLLuTkiIsqpNSLQnwY3NYH28m0uY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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