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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7472690e59832dc284a4b9d3ffc730ddb92e4025666d9dc5335f3046601aeb99' 
  AND token = 'Z9oRdHCYwFftGik5x74JNh/nuA/ldR3wI9nlAxVujEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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