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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70f6bd1c77a0962ad7b2e9455d50cf4f49555878fc388086fd9064237e47d160' 
  AND token = 'UyJfcpFTns95f9LA4DWa3kKIPu7206lBwmS8z6uma7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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