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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e63d95eeced21445c3bd5f438110bbd643e71a35dc9fc22d1f3b0483dec2b3b9' 
  AND token = '47W1ieGxmF7dVJd51IwJvrlVGIKQW7PE9/5kM6NFzTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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