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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3f13620fa7ef04b362b1d3162e7dd071c45b97922d72831688786d7d66d9b7e' 
  AND token = 'JBMbxHHugAXL766lf8rgwg7gt7Nb1mIy8KGn0Xp91dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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