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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d08ecf803f56b4a5e6563c58aab4028cc64f9ba9f5ffb896519a671d5989144' 
  AND token = 'C7iDFf4pfhZATPvJbR9zQD4x9PKn/xeN4n7Ak/XBAR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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