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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37a06287aa26fe9da7522042bfc76ae7941a3f1a26688a2ce62b720e915381aa' 
  AND token = 'wIkjoT16mBI7vGt658F2Vu77pNgXktnpwLzPBf9onb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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