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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2633b1805e7d00a17046c89940543c040c5d71afdad17125d68d51fd3d2dcb34' 
  AND token = 'mxr4JfnwHHAv/IgrMzBQL2Isio0me7W5St81aO4uhW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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