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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8deb1171cb7c1a60f50a2afb2006d6d8805ff67abeca05c9f9a3a029f722aaaf' 
  AND token = 'dgJSHRNsqq/hLOv92QhxkxODXAnjGdt6nfYpGee1bXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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