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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0febcfc1bbee7391cfd1317d5d2e487760c624c6db6afcbb69e3ba1643b25c25' 
  AND token = 'Kc7QZPYw68ZTRwuag8eH/8Xf+UU6tfhLyeL1J76dHlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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