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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae70ece6dbc94d1951d624154c753dfcc30ebb9d02107657a58b46e8b138dab' 
  AND token = 'px8X/mF1WfFUHbsd/aMJRdkrAToi035k151z212M0bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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