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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8eca52e340065c3186c613d76f18d851ad77a140ec4f3a5beac4ce3ecebdda3' 
  AND token = 'rua0hX/+Cr8x+pYiSR66AVBP/T5No23mBiUOvj7RPKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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