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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb18abcede85f2c70ac163f89679dbfc203b9aa73e4cfc0e3881d3b58f3848d' 
  AND token = 'n98UXtkoGOaNeWzg/eSzrvWS7d4U80/CQ07KR8vRXH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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