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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e02b596a30861c68bc452b8a6971137195f03e8ea99620ceedd79500b53548f5' 
  AND token = '/4Ndh4kn0Mw466rt3xysKKeKNwJIlCeE0+kGwvif06Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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