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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ebcd249244c21ad2d1bd6e3a3863cce89452b02f2e80e66af10c064cafe6bb0' 
  AND token = 'R3tGKmnCHvZz/jE3JnP5mVL3grry0pH09BcM+sG/ub8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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