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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fb93382eea1e991d91c20d9291c27821759e362bc12b29dd2a5abd1add24e4' 
  AND token = 'RVenwiGjDgdqqMNou1+KAVMtioSwXNcMmy5QW2zOiBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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