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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0771bec2ec6d1766631edb26645f43e28aeb158b6824983eea60b2a2668f6034' 
  AND token = 'DpAunp2ERtwh9IBK/Lm04mfdoitQHeKVs7qp8scUfP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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