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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd6ba8c12701ec77b808a0cfde8a203eec84c291050102c2ec8629b7a3f58974' 
  AND token = '0FdKpI+4ixTbQDJwdVatrKJI8mXwEjTrKg9mww1S7M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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