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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95f1d4666af2ec3149285f4e91a08a92532e23f86d50c90d59473ef118f6a765' 
  AND token = 'ThdPQMVVQgpit3FCNtww2CTzFKZLXihLV9dJKtzb4E0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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