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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691692a37506a6fb5b13db7bf58ced87b0914c8165db6f0eb969b3556e49238b' 
  AND token = '0BOwV8/rtMTDzX6b8J7LBrutV3y2avFmaKN3M/XmReg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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